Solve the system of equations and choose the correct ordered pair. 3x + 4y = 385x - 5y = -30
1 answer:
<span>3x + 4y= -30---(1)
</span><span>385x - 5y = -30---(2)
equation (1) times 5 on each side---
(</span>3x + 4y)×5=-30×5
15x+20y=-150 ---(3)
equation (2) times 4 on each side---
(385x - 5y)×4 = -30×4
<span>1540x-20y=-120 ---(4)
If u add equation 3 and 4,
</span>(15x+20y)+(<span>1540x-20y</span>)=(-150)+(-120)
1555x=-270
∴x=-270/1555
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